No they will not once the plates are closed growth in the bone will stop, however, some males, those in late puberty for instance, their growth plates are not closed and will grow. not all males growth plates close at 16 that is what I have been trying to tell you. its not that your observation has been totally incorrect, its just you are lumping all the kids into the same pot, some boys stop ,others will continue to grow, it depends on when the plates close and that will depend on when certain hormones have reached certain levels for a certain amount of time... then you see facial hair...... starts to gain muscle mass...for some males it can be as young as 12 others it may not be until they are older and then everywhere in between. Understand some males mature physically at different times thats all.